Bipolar Transistors

Bipolar Transistors are a solid state, three-pin devices made from three layers of silicon. A bipolar transistor is designed to amplify current, bipolar transistors can also function as a switch. There are two main types of transistor, PNP (positive negative positive) or NPN (negative positive-negative).

How a Bipolar transistor is made

Bipolar transistors are constructed by joining two signal diodes back to back creating two PN junctions connected in series, sharing a common P or N terminal. By nature, silicon does not normally conduct electricity well. However, when silicon is treated with certain chemicals or impurities we can make the material and electrons behave in a different way. This process is called doping. The doping process improves the semiconductors ability to conduct electricity.

How do bipolar transistors work?

Bipolar transistors have two possible functions, switching, and amplification. Due to the devices three layers of doped semiconductor material, supplying the transistor with a signal voltage enables the discrete component to act as an insulator or a conductor. This clever change provides the transistors with two basic functions, switching (digital) electronics or amplification (analog) electronics.

Transistors are available in panel, surface and through-hole mounting options in plastic package or metal can versions. All have three terminals or pins, the Base, the Collector, and the Emitter.

They are also available as;

  • Digital transistors - are made of a semiconductor material, usually silicon, which conducts the current (or electricity) with little resistance. They also tend to have at least three terminals for easy connection to an external circuit.
  • UJT transistors - constructed of a bar of lightly dope N type silicone with a small piece of heavily doped P type material attached to one side. Since the silicon bar is lightly dope it has very high resistance.

Applications of bipolar transistors?

Transistors are one of the most widely used discrete components in electronic designs and circuits. Transistors are used for the amplification of all types of electrical signals in circuits made up of individual components rather than ICs (integrated circuits).


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Omschrijving Prijs Transistor Type Maximum DC Collector Current Maximum Collector Emitter Voltage Package Type Mounting Type Maximum Power Dissipation Transistor Configuration Maximum Collector Base Voltage Maximum Emitter Base Voltage Maximum Operating Frequency Pin Count Number of Elements per Chip Dimensions Minimum Operating Temperature
RS-stocknr. 890-2642
Fabrikantnummer2SC3326-A(TE85L,F)
FabrikantToshiba
€ 0,23
Each (In a Pack of 25)
Aantal stuks
NPN 300 mA 20 V SOT-346 (SC-59) Surface Mount 150 mW Single 50 V 25 V - 3 1 2.9 x 1.5 x 1.1mm -
RS-stocknr. 922-8386
FabrikantnummerDSS4540X-13
FabrikantDiodesZetex
€ 0,086
Each (On a Reel of 2500)
Aantal stuks
NPN 4 A 40 V SOT-89 Surface Mount 2 W Single 40 V 6 V 70 MHz 3 1 4.6 x 2.6 x 1.6mm -
RS-stocknr. 170-4161
FabrikantnummerBC548A A1
€ 0,013
Each (On a Tape of 4000)
Aantal stuks
NPN 100 mA 30 V TO-92 Through Hole 500 mW Single 30 V 6 V - 3 1 5.1 x 4.1 x 4.7mm -
RS-stocknr. 122-0086
FabrikantnummerMJ15023G
FabrikantON Semiconductor
€ 4,251
Each (In a Tray of 100)
Aantal stuks
PNP 16 A 200 V TO-204 Through Hole 250 W Single 350 V 5 V 4 MHz 3 1 8.51 x 39.37 x 26.67mm -
RS-stocknr. 166-3785
FabrikantnummerKSC1845FTA
FabrikantON Semiconductor
€ 0,038
Each (On a Tape of 2000)
Aantal stuks
NPN 50 mA 120 V TO-92 Through Hole 500 mW Single 120 V 5 V 110 MHz 3 1 4.58 x 3.86 x 4.58mm -
RS-stocknr. 166-2057
FabrikantnummerFSB560
FabrikantON Semiconductor
€ 0,063
Each (On a Reel of 3000)
Aantal stuks
NPN 2 A 60 V SOT-23 Surface Mount 500 mW Single 80 V 5 V 75 MHz 3 1 2.92 x 1.4 x 0.94mm -
RS-stocknr. 751-4294
FabrikantnummerDSS4540X-13
FabrikantDiodesZetex
€ 0,084
Each (On a Tape of 25)
Aantal stuks
NPN 4 A 40 V SOT-89 Surface Mount 2 W Single 40 V 6 V 70 MHz 3 1 4.6 x 2.6 x 1.6mm -
RS-stocknr. 518-3087
FabrikantnummerPDTC143XT,215
FabrikantNexperia
€ 0,125
Each (In a Pack of 50)
Aantal stuks
NPN - 50 V SOT-23 (TO-236AB) Surface Mount - Single - 7 V - 3 1 3 x 1.4 x 1mm -
RS-stocknr. 146-2074
FabrikantnummerPN2222ABU
FabrikantON Semiconductor
€ 0,03
Each (In a Bag of 10000)
Aantal stuks
NPN 1 A 40 V TO-92 Through Hole 625 mW Single 75 V 6 V 300 MHz 3 1 5.2 x 4.19 x 5.33mm -
RS-stocknr. 807-6027
FabrikantnummerFSB560
FabrikantON Semiconductor
€ 0,066
Each (In a Pack of 50)
Aantal stuks
NPN 2 A 60 V SOT-23 Surface Mount 500 mW Single 80 V 5 V 75 MHz 3 1 2.92 x 1.4 x 0.94mm -
RS-stocknr. 773-7642
FabrikantnummerBCP56T3G
FabrikantON Semiconductor
€ 0,224
Each (In a Pack of 10)
Aantal stuks
NPN 1 A 80 V SOT-223 Surface Mount 1.5 W Single 100 V 5 V 35 MHz 3 + Tab 1 6.5 x 3.5 x 1.63mm -
RS-stocknr. 485-9705
FabrikantnummerTIP2955
€ 1,632
Each (In a Pack of 5)
Aantal stuks
PNP 15 A 60 V TO-247 Through Hole 90 W Single 100 V - 3 MHz 3 1 20.15 x 15.75 x 5.15mm -
RS-stocknr. 170-4158
FabrikantnummerBC547C A1
€ 0,029
Each (On a Tape of 4000)
Aantal stuks
NPN 100 mA 45 V TO-92 Through Hole 500 mW Single 50 V 6 V - 3 1 5.1 x 4.1 x 4.7mm -
RS-stocknr. 103-2936
FabrikantnummerMJE15031G
FabrikantON Semiconductor
€ 1,079
Each (In a Tube of 50)
Aantal stuks
PNP 8 A 150 V TO-220AB Through Hole 50 W Single 150 V 5 V 30 MHz 3 1 9.28 x 10.28 x 4.82mm -
RS-stocknr. 485-9755
FabrikantnummerTIP31C
€ 0,49
Each (In a Pack of 5)
Aantal stuks
NPN 3 A 100 V TO-220 Through Hole 2 W Single 100 V 5 V - 3 1 9.15 x 10.4 x 4.6mm -
RS-stocknr. 739-0331
FabrikantnummerKSP2907ATA
FabrikantON Semiconductor
€ 0,161
Each (In a Pack of 10)
Aantal stuks
PNP 600 mA 60 V TO-92 Through Hole 625 mW Single -60 V -5 V - 3 1 4.58 x 3.86 x 4.58mm -
RS-stocknr. 168-6173
FabrikantnummerTIP50
€ 0,556
Each (In a Tube of 50)
Aantal stuks
NPN 1 A 400 V TO-220 Through Hole 2 W Single 500 V 5 V 10 MHz 3 1 9.15 x 10.4 x 4.6mm -
RS-stocknr. 796-9701
FabrikantnummerBC547C A1
€ 0,114
Each (In a Pack of 250)
Aantal stuks
NPN 100 mA 45 V TO-92 Through Hole 500 mW Single 50 V 6 V - 3 1 5.1 x 4.1 x 4.7mm -
RS-stocknr. 463-634
FabrikantnummerMJE15032G
FabrikantON Semiconductor
€ 1,266
Each (In a Pack of 5)
Aantal stuks
NPN 8 A 250 V TO-220AB Through Hole 2 W Single 250 V 5 V 30 MHz 3 1 9.28 x 10.28 x 4.82mm -
RS-stocknr. 178-1437
FabrikantnummerTIP31C
€ 0,405
Each (In a Tube of 50)
Aantal stuks
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